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111.
电荷转移型导电配位化合物 总被引:5,自引:0,他引:5
本文简述了电荷转移型导电配位化合物产生,发展,研究现状及以未来趋势。 相似文献
112.
Benjamin W. Heinrich Jose I. Pascual Katharina J. Franke 《Progress in Surface Science》2018,93(1):1-19
In superconductors, magnetic impurities induce a pair-breaking potential for Cooper pairs, which locally affects the Bogoliubov quasiparticles and gives rise to Yu-Shiba-Rusinov (YSR or Shiba, in short) bound states in the density of states (DoS). These states carry information on the magnetic coupling strength of the impurity with the superconductor, which determines the many-body ground state properties of the system. Recently, the interest in Shiba physics was boosted by the prediction of topological superconductivity and Majorana modes in magnetically coupled chains and arrays of Shiba impurities.Here, we review the physical insights obtained by scanning tunneling microscopy into single magnetic adsorbates on the s-wave superconductor lead (Pb). We explore the tunneling processes into Shiba states, show how magnetic anisotropy affects many-body excitations, and determine the crossing of the many-body ground state through a quantum phase transition. Finally, we discuss the coupling of impurities into dimers and chains and their relation to Majorana physics. 相似文献
113.
Y-Ba-Cu-O体系超导材料的表面分析和热稳定性研究 总被引:1,自引:1,他引:0
XPS 研究表明,在空气中久置后的 Y2O3,BaO 和 CuO 以及 YBa2Cu3O~7,超导体的表面都生成有碳酸盐.超导体中的元素价态为:钇+3价,钡+2价,铜主要+2价.原料 CuO 在真空中在400℃加热后大部分被还原成 Cu2O;制备不久的超导体在同样条件下其 Cu2+离子较难还原,然而在空气中久置后的超导体中的 Cu2+又较易还原.这些现象既反映了原料氧化物经烧结后由于生成了 YBa2Cu3O~7相而增加了稳定性,又说明这种超导材料仍具有亚稳性质. 相似文献
114.
Tl2Ba2Ca2Cu3O10 was reported to be a superconductor with a highest transition temperature of 125 K among the homologous series of Tl2Ba2Can-1CunO2n+4. The direct information on the Cu ion site at the atomic level is important for elucidating the superconductivity mechanism. The local bond properties of Tl2Ba2Ca2Cu3O10 were studied using the average band-gap model. The calculated results show that the covalency of Cu(1)-O bond is 0.561, and the average covalency of Cu(2)-O is 0.296. M(o)ssbauer isomer shifts of 57Fe in Tl2Ba2Ca2Cu3O10 were calculated using the chemical surrounding factor, defined by covalency and electronic polarizability. It is verified that for lower doping, Fe substitute the Cu at the Cu (1) site in forms of Fe3+ and Fe4+; for higher doping, Fe3+ and Fe4+ ion occupies Cu(1) and Cu(2) site respectively.The studies show that the determination of the correspondence between spectrum components and actual copper sites occupied by M(o)ssbauer nucleus was made easier with the aid of the calculation results of the chemical bond parameters. 相似文献
115.
We prove an index theorem for the existence of Majorana zero modes in a semiconducting thin film with a sizable spin-orbit coupling when it is adjacent to an s-wave superconductor. The theorem, which is analogous to the Jackiw-Rebbi index theorem for the zero modes in mass domain walls in one-dimensional Dirac theory, applies to vortices with odd flux-quantum in a semiconducting film in which s-wave superconductivity and a Zeeman splitting are induced by proximity effect. The momentum space construction of the zero-mode solution presented here is complementary to the approximate real space solution of the Bogoliubov-de Gennes equations at a vortex core (Sau et al., arXiv:0907.2239 [17]), proving the existence of non-degenerate zero-energy Majorana excitations and the resultant non-Abelian topological order in the semiconductor heterostructure. With increasing magnitude of the proximity-induced pairing potential, the non-Abelian superconducting state makes a topological quantum phase transition to an ordinary s-wave superconducting state which no topological order. 相似文献
116.
Rikio Settai Keisuke Katayama Tetsuya Takeuchi Ilya Sheikin 《Journal of Physics and Chemistry of Solids》2010,71(4):700-703
We have studied superconducting properties by measuring the electrical resistivity and magnetization for a single crystal of Rh17S15 with a superconducting transition temperature Tc=5.4 K. The upper critical field Hc2(0) and the lower critical field Hc1(0) were obtained as 20.5 and 0.0033 T, respectively. Correspondingly, the coherence length and the penetration depth were estimated to be 40 and 4900 Å, respectively, indicating that Rh17S15 is a typical type-II superconductor with strong correlations of conduction electrons with a 4d-electron character of Rh atoms. The present electron correlations are formed to be enhanced with increasing pressure. 相似文献
117.
The pattern transition induced by lattice anisotropy (LA) and magnetic impurities is computationally observed in near-optimally doped d-wave superconductors (DSCs). For the single impurity case, a transition from the checkerboard to stripe pattern can be induced by a very weak LA. For the two-impurity case, an orientation transition from the longitudinal stripe into transverse pattern is observed when the LA ratio reaches some critical value. At the critical point, the structures around impurities can restore checkerboard patterns. These results indicate that the formation of stripes in DSCs might induced by various effects, and could be tunable experimentally. 相似文献
118.
Mathieu Lu-Dac Viktor V. Kabanov 《Physica C: Superconductivity and its Applications》2010,470(19):942-945
We investigate the situation where a mesoscopic 1D ring or 2D cylinder is subject to a magnetic field by simulating the time dependant Ginzburg–Landau equations with periodic boundary conditions. We investigate the different possible evolutions for the 1D phase slip phenomenon. The case of the multiple phase slips is analyzed in details and we study the competition between simultaneous and consecutive multiple phase slips analytically and numerically. In 2D we study the creation of vortex–antivortex pairs. Following the theory of the Kibble–Zurek mechanism, we quenched the sample by applying a strong current and observe vortex–antivortex pairs dynamics. 相似文献
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